Yes probably so. Although the S3 is a very popular phone and has a lot of dev support, the Nexus has a humongous amount.
Yeah I was looking over at XDA and saw that the Nexus forum for Android Development has almost 200,000 posts! And the list of ROMs is incredible, could be flashing for days! How is the data speed on their prepaid? I know coverage, and what not, but just in general?